This command becomes particularly useful when experiencing VPN connectivity issues like Error 720, where the TCP/IP stack might have become corrupted. I've personally used it when:

• PPTP/L2TP VPN connections fail with obscure errors
• IP configuration shows inconsistent behavior despite correct settings
• Network troubleshooting suggests TCP/IP stack corruption

The netsh int ip reset command performs a targeted reset of these components:

1. TCP/IP protocol stack (returns to default state)
2. Winsock catalog (critical for socket operations)
3. IP-related registry keys (HKLM\System\CurrentControlSet\Services\Tcpip)
4. Interface bindings

Important settings that remain unchanged:

- Static IP configurations (though they may need reapplication)
- DNS server settings
- Firewall rules
- Remote Desktop configurations

Here's exactly how I resolved a persistent VPN Error 720:

1. Open elevated Command Prompt (Run as Administrator)
2. Execute: netsh int ip reset resetlog.txt
3. Review the resetlog.txt for confirmation
4. Reboot (essential for changes to take effect)
5. Reconfigure any custom TCP/IP settings

For more surgical troubleshooting, consider these variants:

# Reset IPv4 only
netsh int ipv4 reset

# Reset IPv6 only
netsh int ipv6 reset

# Reset Winsock separately
netsh winsock reset

Before executing the reset:

1. Document current network settings (ipconfig /all)
2. Ensure physical access to the machine if remote
3. Schedule downtime as reboot is required
4. Backup network-related registry keys

Post-reset verification steps:

1. Check system event logs for TCP/IP-related errors
2. Test basic connectivity (ping 8.8.8.8)
3. Verify interface bindings (netsh int ip show config)
4. Test VPN connection with packet capture if possible

When troubleshooting VPN connectivity issues like Error 720 on Windows Server, the netsh int ip reset command often surfaces as a potential solution. This command performs a targeted reset of TCP/IP stack components without affecting most network configurations:

# Breakdown of what gets reset:
1. TCP/IP protocol stack (returns to default state)
2. Winsock catalog (clears corrupted entries)
3. IP configuration (retains static IPs but refreshes DHCP)
4. Route table (preserves persistent routes)

The reset proves particularly effective for:

• PPTP VPN connections failing with Error 720
• Cases where TCP/IP stack corruption is suspected
• Networking issues persisting after standard troubleshooting

Example scenario where this helped:

# Before reset (error state):
PS> Test-NetConnection -ComputerName vpn.example.com -Port 1723
WARNING: TCP connect to vpn.example.com:1723 failed

# After reset:
PS> netsh int ip reset reset.log
PS> Restart-Computer -Force

# Verification:
PS> Test-NetConnection -ComputerName vpn.example.com -Port 1723
ComputerName     : vpn.example.com
RemotePort       : 1723
SourceAddress    : 192.168.1.100
TcpTestSucceeded : True

For production environments, consider this careful approach:

# 1. Create backup of current configuration
netsh dump > network_backup.txt

# 2. Execute reset with logging
netsh int ip reset reset.log

# 3. Verify changes (sample PowerShell check)
Get-NetTCPConnection -State Established | 
  Where-Object {$_.RemotePort -eq 1723} | 
  Select LocalAddress,RemoteAddress

# 4. Rollback if needed
netsh exec network_backup.txt

For stubborn cases, combine with:

# Reinstall VPN components
Remove-VpnConnection -Name "CorpVPN" -Force
Add-VpnConnection -Name "CorpVPN" -ServerAddress vpn.example.com -TunnelType Pptp

# Or deeper TCP/IP reset:
netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log

Remember that while this command won't erase static IPs or critical configurations, always:

• Schedule during maintenance windows
• Have console access available
• Document pre-reset settings